<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 页面未找到</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f5f5f5;
            color: #333;
            text-align: center;
            padding: 50px 0;
            line-height: 1.6;
        }
        .container {
            max-width: 600px;
            margin: 0 auto;
            padding: 20px;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        h1 {
            font-size: 4em;
            margin: 0;
            color: #e74c3c;
        }
        p {
            font-size: 1.2em;
            margin: 20px 0;
        }
        a {
            display: inline-block;
            margin-top: 20px;
            padding: 10px 20px;
            background: #3498db;
            color: white;
            text-decoration: none;
            border-radius: 4px;
            transition: background 0.3s;
        }
        a:hover {
            background: #2980b9;
        }
        .sad-face {
            font-size: 5em;
            margin: 20px 0;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="sad-face">:(</div>
        <h1>404</h1>
        <h2>页面未找到</h2>
        <p>抱歉，您访问的页面不存在或已被移除。</p>
        <p>请检查URL是否正确，或者返回首页。</p>
        <a href="/">返回首页</a>
    </div>
</body>
</html>